The Audi CGLB is a 1,984 cc, inline-four turbocharged petrol engine produced between 2019 and 2023. It belongs to the Volkswagen Group’s updated EA888 Gen 4 engine family, featuring advanced thermal management, a 12 V mild-hybrid system (MHEV), and direct fuel injection. In its standard tuning, it produces 140 kW (190 PS) and 320 Nm of torque, with enhanced low-end responsiveness due to electric turbocharger assistance and dual injection (TFSI + MPI).
Fitted primarily to the Audi A4 (B9.5), A5 (B9.5), and Q5 (facelift) models in 40 TFSI trim, the CGLB was engineered for balanced performance and improved real-world efficiency. It supports cylinder deactivation (ACT) under light load and integrates with a 48 V electrical architecture in select applications to reduce emissions. Driving characteristics emphasize smooth refinement and strong mid-range pull, meeting Euro 6d emissions standards across its production run.
One documented concern is premature wear of the high-pressure fuel pump (HPFP) in early production units, highlighted in Audi Service Information Bulletin 2020-09-03. This issue stems from inadequate lubrication under extended service intervals. In 2021, Audi issued revised fuel pump specifications and updated oil change protocols to mitigate long-term reliability risks.
All CGLB variants meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/9102).
The Audi CGLB is a 1,984 cc inline-four turbocharged petrol engine from the EA888 Gen 4 family (2019–2023). It integrates dual injection, electric turbo assistance, and mild hybrid technology to deliver responsive performance with reduced emissions. Designed for Euro 6d compliance, it balances refinement and efficiency in Audi’s mid-size lineup.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,984 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged with electrically assisted turbo (eTurbo) | |
| Bore × stroke | 82.5 mm × 92.8 mm | |
| Power output | 140 kW (190 PS) @ 4,200–6,000 rpm | |
| Torque | 320 Nm @ 1,450–4,100 rpm | |
| Fuel system | Bosch HDEV6 direct injection + multi-point injection (MPI) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 11.0:1 | |
| Cooling system | Water-cooled with dual-circuit thermal management | |
| Turbocharger | Electrically assisted turbo (Garrett eTurbo, 200 mbar boost assist) | |
| Timing system | Chain (reinforced; front-mounted with improved tensioner) | |
| Oil type | VW 504 00 / 507 00 (SAE 0W-20) | |
| Dry weight | 112 kg |
The eTurbo and dual injection provide strong low-RPM response ideal for urban driving but require strict adherence to 15,000 km oil change intervals to prevent high-pressure fuel pump wear and turbo bearing degradation. VW 504 00 (0W-20) oil is critical due to its low viscosity and protection of the electric turbocharger and HPFP. Extended idling and cold starts increase stress on the fuel system. The HDEV6 pump demands high-octane petrol (RON 98) to prevent knock and injector coking. Post-2021 models feature revised fuel pumps; pre-2021 units should follow Audi SIB 2020-09-03 for inspection. PCV system requires monitoring to prevent oil consumption and carbon buildup.
Oil Specs: Requires VW 504 00 / 507 00 (0W-20) specification (Audi SIB 2021-05-07). Supersedes ACEA C5.
Emissions: All CGLB models are certified to Euro 6d standards (VCA Type Approval #VCA/EMS/9102).
Power Ratings: Measured under SAE J1349 standards. 140 kW output requires RON 98 fuel (Audi TIS Doc. A88400).
Audi Technical Information System (TIS): Docs A88400, A88401, SIB 2020-09-03
VCA Type Approval Database (VCA/EMS/9102)
SAE International: J1349 Engine Power Certification Standards
The Audi CGLB was used across Audi's B9.5 platform with transverse mounting and shared architecture with Volkswagen Group siblings. This engine received platform-specific adaptations-shorter intake tracts in the A4 and revised cooling layouts in the Q5-and from 2021 received updated fuel system components, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side cylinder block near the exhaust manifold (Audi TIS A88400). The 8th VIN digit indicates engine family ('D' for EA888 series). Pre-2021 models have silver valve covers with black plastic timing covers; post-2021 units use black valve covers. Critical differentiation from CAHA: CGLB includes eTurbo and MHEV integration. Service parts require production date verification - fuel pumps for engines before 09/2020 are incompatible with later units due to internal redesign (Audi SIB 2020-09-03).
The CGLB's primary reliability risk is high-pressure fuel pump wear on early builds, with elevated incidence in mixed urban/highway use. Internal Audi quality reports from 2022 indicated a notable share of pre-2021 engines requiring HPFP replacement before 100,000 km, while UK DVSA records link a significant portion of emissions-related MOT failures to PCV clogging in city-driven vehicles. Cold-start cycles and extended idling increase fuel system stress, making oil quality and interval adherence critical.
Analysis derived from Audi technical bulletins (2019-2023) and UK DVSA failure statistics (2020-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI CGLB.
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